Cloning from https://github.com/moovweb/gvm.git to /Users/tan9le/.gvm
No existing Go versions detected
Installed GVM v1.0.22
Please restart your terminal session or to get started right away run
`source /Users/tan9le/.gvm/scripts/gvm`

Go 1.5+ removed the C compilers from the toolchain and replaced them with one written in Go. Obviously, this creates a bootstrapping problem if you don't already have a working Go install. In order to compile Go 1.5+, make sure Go 1.4 is installed first.